Article
Chemistry, Multidisciplinary
Dong-kyu Son, Sooan Bae, Shrine Maria Nithya Jeghan, Gibaek Lee
Summary: Highly efficient and durable FeCo-N,S@CNFs catalysts were synthesized for oxygen reduction reactions. The catalysts showed defect-rich active sites, enhancing the ORR activity, and exhibited long-term stability and high tolerance to methanol. The synergistic interactions between metals and heteroatoms played a crucial role in enhancing the ORR activity. These catalysts can be widely used in battery-based systems and fuel cell applications.
Article
Chemistry, Multidisciplinary
Lun An, Patricia De La Torre, Peter T. Smith, Mina R. Narouz, Christopher J. Chang
Summary: We present a supramolecular approach to catalyzing photochemical CO2 reduction using second-sphere porosity and charge effects. This work establishes that synergistic pendants in the secondary coordination sphere can be leveraged as a design element to augment catalysis at primary active sites within confined spaces.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Materials Science, Multidisciplinary
Xuyan Zhou, Shufen Chu, Zeyu Jin, Kailong Hu, Pan Liu, Hua-Jun Qiu, Xi Lin
Summary: Modifying the structures of metal-N-C single-atom catalysts to enhance their catalytic activities is challenging but desirable. The introduction of Ru to create RuFe-N-C or RuCo-N-C double-atom catalysts (DACs) can significantly improve the bifunctional ORR/OER activities, surpassing the individual Fe(Co)-N-C and Ru-N-C. The synergistic effect in RuM-N-C DACs is attributed to the combined optimized metal atoms, which alter the charge density and d-band center, affecting the adsorption energies and catalytic activity of intermediates. The synthesis of RuFe-N-C using a bimetal MOF precursor demonstrates exceptional ORR/OER activities, outperforming Fe-N-C, Ru-N-C, and even commercial Pt/C-RuO2.
ACS MATERIALS LETTERS
(2023)
Article
Engineering, Environmental
Mei Zhang, You Xu, Hugang Zhang, Zhongyao Duan, Tianlun Ren, Ziqiang Wang, Xiaonian Li, Liang Wang, Hongjing Wang
Summary: Pd-based materials show great potential as alternatives to Pt for oxygen reduction reactions (ORR). By modifying the electronic structure and support effect, the performance of Pd-based catalysts in ORR can be significantly improved. The proposed synthetic method provides a feasible approach for the rational design of heteroatoms-doped carbon-metal composites with high performance in ORR and other energy applications.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Multidisciplinary
Bohua Ren, Zhen Zhang, Guobin Wen, Xiaowen Zhang, Mi Xu, Yueying Weng, Yihang Nie, Haozhen Dou, Yi Jiang, Ya-Ping Deng, Guiru Sun, Dan Luo, Lingling Shui, Xin Wang, Ming Feng, Aiping Yu, Zhongwei Chen
Summary: This study proposes a dual-scale design strategy to address the issues of low-energy efficiency and insufficient durability in the electrochemical CO2 reduction to CO process by implanting a non-noble active Sn-ZnO heterointerface inside the nanopores of high-surface-area carbon nanospheres.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Mengqiu Xu, Qifan Xie, Delong Duan, Ye Zhang, Yuhu Zhou, Haiqiao Zhou, Xiaoyu Li, Yao Wang, Peng Gao, Wei Ye
Summary: The industrial Haber-Bosch process for ammonia synthesis is important but energy-intensive and polluting, leading to research in eco-friendly NH3 synthesis. A study on electrochemical nitrate reduction reaction (NTRR) using single-atom Cu catalyst found excellent performance, offering guidance for the rational design of highly active, selective, and durable electrocatalysts for NTRR.
Article
Electrochemistry
Runzhi Zhang, Zebin Yu, Ronghua Jiang, Jun Huang, Yanping Hou, Fei Yang, Hongxiang Zhu, Boge Zhang, Yiyi Huang, Bo Ye
Summary: The study successfully constructed an efficient bifunctional electrocatalyst for overall water splitting by using S-doped carbon bridged semi crystalline MILN-based Co3S4/MnS2 nanostructure, achieving a dual synergistic effect to enhance the performance of the catalyst.
ELECTROCHIMICA ACTA
(2021)
Article
Chemistry, Physical
Jin Wang, Hao Huang, Peng Wang, Shuang Wang, Jinping Li
Summary: This paper studied a high-efficiency non-metallic catalyst for the electrocatalytic synthesis of NH3, prepared using a sulfur-modified N-doped MOF, achieving high ammonia yield and optimal efficiency, with excellent long-term durability.
Article
Chemistry, Physical
Yiwei Zhao, Yue Yu, Yuanhong Wang, Jicheng Ma, Shuangxi Xing
Summary: Carbon-based catalyst co-doped with Cu, S and N shows superior activity for ORR in alkaline media, with onset and half-wave potential comparable to Pt/C. The efficient bonding between different elements contributes to the high ORR activity and great durability of the catalyst.
Article
Chemistry, Multidisciplinary
Shi-Ming Li, Yi Shi, Jing-Jie Zhang, Ying Wang, Huan Wang, Jia-Xing Lu
Summary: Utilizing electrocatalytic reduction of CO2 to synthesize carbamates is an effective method of CO2 utilization. Developing high-performance electrocatalysts can efficiently promote this process for sustainable development. Single-atom catalysts, like the atomically dispersed Cu species on N-doped carbon nanosheet composite material (Cu-N-C), show potential to enhance the reaction process. The Cu-N-C material exhibits superior catalytic performance in synthesizing methyl N-phenylcarbamate, with an optimized yield of 71% at room temperature and normal pressure. It also demonstrates good stability after repeated use and broad applicability to convert various amines into carbamates smoothly.
Article
Chemistry, Physical
Long Huang, Linzhi Zuo, Tao Yu, Haoquan Wang, Zeyang He, Hu Zhou, Shichuan Su, Ting Bian
Summary: In this study, nitrogen and sulfur co-doped carbon leaves decorated with cobalt/cobalt sulfide nanoparticles were prepared by pyrolysis of a modified zeolitic imidazolate framework. The resulting material exhibited outstanding oxygen reduction reaction performance and long-term stability, and achieved high power density and specific capacity in zinc-air batteries.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Zhongjun Ma, Xilin Zhang, Xueyun Han, Dapeng Wu, Hongju Wang, Zhiyong Gao, Fang Xu, Kai Jiang
Summary: By incorporating nickel phthalocyanine into defect-rich Ketjenblack through pi-pi stacking, the ECR performance can be greatly improved, showing high selectivity and activity in converting CO2 to CO. This synergistic catalytic effect is achieved by enhancing electron acceptability, reducing the formation energy of *COOH, and inhibiting the rival hydrogen evolution reaction.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Physical
Shilong Fu, Ming Li, Wiebren de Jong, Ruud Kortlever
Summary: N-doped biochar catalysts with different physicochemical properties were synthesized and used for electrochemical CO2 reduction to CO. The catalytic performance varied significantly among the prepared catalysts, with maximum faradaic efficiency to CO ranging from 26.8% to 94.9% at around -0.8 to -0.9V vs RHE. Increasing the specific surface area and N-doping level did not effectively improve the catalytic performance. However, improving the degree of graphitization, surface hydrophobicity, the abundance of defects, and optimizing the porosity of the N-doped biochar catalyst enhanced the catalytic performance for the CO(2)RR.
Article
Chemistry, Physical
Shuang Gao, Li Lin, Hairui Wang, Ping Nie, Juan Jian, Jiahui Li, Limin Chang
Summary: The novel multi-metal electrocatalyst Co3Mo3C/Co@NC exhibits high activity and fast kinetics, reducing overpotentials effectively. The nitrogen-doped carbon skeleton enhances corrosion resistance and conductivity of the composite electrode, facilitating fast electron transfer.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Mengjie Feng, Qi Zhang, Shigang Sun, Xinsheng Zhang, Shuozhen Hu
Summary: A Fe/N/C catalyst doped with iron, nitrogen, and sulfur was successfully synthesized for oxygen reduction reaction with high electrochemical activity and stability. The catalyst featured graphene-like nanosheets around carbon nanoparticles and a high content of pyridinic-N and Fe-N-x moieties, resulting in a near 4e(-) transfer for the ORR.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Multidisciplinary
Junil Choi, Minho Kim, Song Kyu Kang, Jihoon Kim, Jungseub Ha, Hyun Ho Shin, Taiho Park, Won Bae Kim
Summary: In this study, a bifunctional electrode material for electrochemical oxidations and CO2 electrolysis was successfully prepared. By in situ phase transition and exsolution of Ni-Fe alloy nanoparticles in a reducing atmosphere, NiFe-R.P.PSFNNb exhibited superior electrochemical performance.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2022)
Article
Chemistry, Physical
Daehee Jang, Junbeom Maeng, Jihoon Kim, Hyunsu Han, Gwan Hyeon Park, Jungseub Ha, Dongwoo Shin, Yun Jeong Hwang, Won Bae Kim
Summary: Ammonia production from electrocatalytic nitrate reduction reaction (NO3RR) is an important research area for replacing the Haber-Bosch process. However, low ammonia selectivity due to competitive hydrogen evolution reaction is a challenge for NO3RR. This study synthesized a series of manganese copper oxide (MnCuOx) catalysts with different concentrations of oxygen vacancies using Ar or O2 plasma treatments. MnCuOx-H catalyst with high oxygen vacancy concentration exhibited a high NH3 yield rate (9.4 mg cm-2h-1) and Faradaic efficiency (86.4%). The improved performance of MnCuOx-H can be attributed to the increased oxygen vacancies from plasma treatment, which facilitate NO3 adsorption and weaken N-O bonds. This strategy provides novel guidance for the catalyst design of NO3RR, aiming to achieve higher NH3 selectivity and production rate.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Physical
Hyunsu Han, Juhwan Im, Myungsuk Lee, Daehyun Choo
Summary: In this study, highly efficient diatomic electrocatalysts with Ni and Mn single-atom pair sites were synthesized on N-doped porous carbon framework for CO2 conversion. The resulting catalysts exhibited a high Faradaic efficiency and industrially relevant current density. The experimental measurements and theoretical calculations revealed that the synergistic electronic modification effect of neighboring Ni and Mn single atoms played a favorable role in the reaction steps of CO2 conversion.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Energy & Fuels
Hyun Ho Shin, Junil Choi, Taiho Park, Won Bae Kim
Summary: Anode-supported proton-conducting solid oxide fuel cells (PC-SOFCs) fabricated with two different proton-conducting oxides, BaCe0.7Zr0.1Y0.1Yb0.1O3-delta (BCZYYb) and BaZr0.8Y0.2O3-delta (BZY), were compared to investigate their electrochemical performances when fueled with syngas. The BCZYYb cells exhibited higher maximum power density (MPD) than the BZY cells when operating on H-2, but degraded more rapidly when operating on syngas. Decreasing the anode thickness improved the stability of BCZYYb cells on syngas. Heterogeneous catalysis experiments showed no significant difference in catalytic activity between the anode powders prepared with the two proton-conducting oxides.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2023)
Article
Chemistry, Multidisciplinary
Minho Kim, Song Kyu Kang, Junil Choi, Hwichan Ahn, Junhyuk Ji, Sang Ho Lee, Won Bae Kim
Summary: Patterned electrodes have been developed to improve fast-charging attributes in solid-state lithium-ion batteries by enhancing electrochemically activated surfaces within the electrodes. The study demonstrates the potential of patterned electrodes in improving electrode dynamics through customized empty channel structures and a composite electrolyte.
Article
Chemistry, Multidisciplinary
Namgi Jeon, Sujin Kim, Akhil Tayal, Jungmok Oh, Wongeun Yoon, Won Bae Kim, Yongju Yun
Summary: Modulating the interactions between catalyst components is crucial for improving the efficiency of NH3 decomposition. In this study, the performance of Ru-based catalysts was enhanced by controlling the interface between Ru particles and BaCeO3 support. Y-doping facilitated the formation of the SMSI interface and improved the stability of the catalyst.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2022)
Article
Chemistry, Multidisciplinary
Song Kyu Kang, Minho Kim, Hyun Ho Shin, Wongeun Yoon, Seungjun Lee, Daehee Jang, Junil Choi, Gwan Hyeon Park, Jungsoo Park, Won Bae Kim
Summary: Mn3-xFexO4 nanosheets with interconnected conductive networks were synthesized, showing high reversible capacity and rate capability, which can overcome the theoretical limitations of conventional metal oxide materials and boost Li-ion storage capacity by surface alteration.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Physical
Jeongmyeong Kim, Minji Yun, Byeongju Song, Won Bae Kim, Yongju Yun
Summary: The development of chiral catalysts is crucial for producing enantiopure compounds, which are highly sought after by the pharmaceutical and fine chemical industries. Heterogeneous catalysts, such as supported and chirally modified Pt catalysts, offer advantages like high stability, easy separation, and reusability. In this study, a highly efficient and versatile Pt/B-SiO2 catalyst was developed through the facile impregnation method, demonstrating excellent enantioselective hydrogenation performance for alpha-keto esters.
Review
Energy & Fuels
Minho Kim, Hwichan Ahn, Junil Choi, Won Bae Kim
Summary: Silicon is a promising alternative to graphite anode in lithium-ion batteries, but it faces challenges such as particle pulverization and unstable solid electrolyte interphase. All-solid-state batteries provide a different interface for silicon anodes, offering potential for improved electrochemical stability and lifespan. Incorporating silicon anodes into all-solid-state batteries is a strong strategy to overcome the limitations of conventional anode materials, but contact losses between silicon and solid-state electrolyte need to be addressed for optimal performance and stability.
Review
Chemistry, Physical
Venkata Thulasivarma Chebrolu, Daehee Jang, Gokana Mohana Rani, Chaeeun Lim, Kijung Yong, Won Bae Kim
Summary: The concept of green ammonia with zero carbon emissions has gained attention as countries seek to reduce their reliance on fossil fuels. The electrochemical nitrogen reduction reaction (ENRR) has emerged as a promising approach to produce ammonia, but there are challenges in terms of efficiency and production rates. This review provides an overview of the importance of ammonia as an energy carrier, the theory and mechanism of ENRR, different electrolytic systems for ammonia synthesis, and the latest advances in electrocatalysts for ENRR.
Article
Energy & Fuels
Jaejin Bae, Junhyuk Ji, Minho Kim, Song Kyu Kang, Gwan Hyeon Park, Yun Ho Jeong, Changshin Jo, Won Bae Kim
Summary: Nowadays, thickness optimization of an electrode is an effective approach for enhancing the energy density and areal capacity of Li-ion batteries. This paper presents a simple electrospinning technique to fabricate lithium titanium oxide (LTO) nanowire sheet bundles with controllable electrode thickness. The unique microscale layer-by-layer configuration of the LTO nanowires in the sheet bundles enables high areal capacity and efficient penetration of electrolytes. The fabricated LNSB electrode exhibits an ultrahigh areal capacity, outperforming commercial graphite anodes, and holds promise for advanced energy storage applications.
Article
Engineering, Electrical & Electronic
Jae Won Youn, Gwan Hyeon Park, Minho Kim, Song Kyu Kang, Daehee Jang, Won Bae Kim
Summary: F-doped carbon layer coating is an effective surface modification method to enhance the intrinsic conductivity of active materials and facilitate the accommodation of solvated Li+ ions near the carbon surface. By using a cost-effective coating material PVDF, high electrochemical performance can be achieved in lithium-ion capacitors (LICs). A uniform and thin coating of an F-doped amorphous carbon layer on natural graphite (NG) surface results in a high energy density and improved capacity retention compared to pristine NG.
ACS APPLIED ELECTRONIC MATERIALS
(2023)
Article
Chemistry, Physical
Haeryang Lim, Jae-Yeop Jeong, Dae Hwan Lee, Shin-Woo Myeong, Giwon Shin, Dayeong Choi, Won Bae Kim, Sung Mook Choi, Taiho Park
Summary: In this study, a novel aryl ether-free poly(fluorene) anion exchange membranes (AEMs) were developed and their morphology and conformation were analyzed. It was found that PFPB-QA, with the lowest glass transition temperature, exhibited the most oriented structure and well-connected ion transport channels, achieving high conductivity and alkaline stability.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Materials Science, Multidisciplinary
Daehee Jang, Hyunsu Han, Junbeom Maeng, Wongeun Yoon, Minseon Park, Won Bae Kim
Summary: This study prepares and investigates highly active and stable PdSb nanoparticle catalysts for electrooxidation reactions of various alcohols under alkaline conditions. The optimized PdxSby/PC catalysts show high catalytic activity and long-term stability, which can significantly improve the catalytic performance of alcohol fuel cells.
MATERIALS ADVANCES
(2022)